/Engine/Source/Runtime/Core/Public/Math/UnrealMathUtility.h
Rotator specific interpolation Similar to Lerp, but does not take the shortest path. Allows interpolation over more than 180 degrees.
template<typename T, typename U> static [UE::Math::TRotator](API\Runtime\Core\Math\TRotator)< T > LerpRange ( const [UE::Math::TRotator](API\Runtime\Core\Math\TRotator)< T > & A, const [UE::Math::TRotator](API\Runtime\Core\Math\TRotator)< T > & B, U Alpha )